1. Bhutta ZA, Dean SV, Imam AM, Lassi ZS: A Systematic Review of Preconception Risks and Interventions. 2011, The Aga Khan University
2. Johnson K, Posner SF, Biermann J, Cordero JF, Atrash HK, Parker CS, Boulet S, Curtis MG, Group CAPCW, Select Panel on Preconception C: Recommendations to improve preconception health and health care - United States. A report of the CDC/ATSDR Preconception Care Work Group and the Select Panel on Preconception Care. MMWR Recomm Rep. 2006, 55: 1-23.
3. Howson C, Kinney M, Lawn J: Born Too Soon: Preterm birth matters. Reproductive Health. 2013,
4. Institute of Medicine: Preterm Birth: Causes, Consequences, and Prevention. 2007, Washington, DC: National Academy Press
5. Wise PH: Transforming preconceptional, prenatal, and interconceptional care into a comprehensive commitment to women's health. Women's Health Issues. 2008, 18: S13-S18. 10.1016/j.whi.2008.07.014.